diff options
Diffstat (limited to 'testcases/kernel/syscalls/mmap/mmap05.c')
| -rw-r--r-- | testcases/kernel/syscalls/mmap/mmap05.c | 220 |
1 files changed, 49 insertions, 171 deletions
diff --git a/testcases/kernel/syscalls/mmap/mmap05.c b/testcases/kernel/syscalls/mmap/mmap05.c index 82f122543..7abddaa9e 100644 --- a/testcases/kernel/syscalls/mmap/mmap05.c +++ b/testcases/kernel/syscalls/mmap/mmap05.c @@ -1,205 +1,83 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) International Business Machines Corp., 2001 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - * the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * 07/2001 Ported by Wayne Boyer + * Copyright (c) 2023 SUSE LLC Avinesh Kumar <avinesh.kumar@suse.com> */ -/* - * Test Description: - * Call mmap() to map a file creating mapped memory with no access under - * the following conditions - - * - The prot parameter is set to PROT_NONE - * - The file descriptor is open for read(any mode other than write) - * - The minimum file permissions should be 0444. - * - * The call should succeed to map the file creating mapped memory with the - * required attributes. - * - * Expected Result: - * mmap() should succeed returning the address of the mapped region, - * and an attempt to access the contents of the mapped region should give - * rise to the signal SIGSEGV. +/*\ + * [Description] * - * HISTORY - * 07/2001 Ported by Wayne Boyer + * Verify that, mmap() call with 'PROT_NONE' and a file descriptor which is + * open for read and write, succeeds to map the file creating mapped memory, + * but any attempt to access the contents of the mapped region causes the + * SIGSEGV signal. */ -#include <stdio.h> + #include <stdlib.h> -#include <sys/types.h> -#include <errno.h> -#include <unistd.h> -#include <fcntl.h> -#include <string.h> -#include <signal.h> -#include <sys/stat.h> -#include <sys/mman.h> #include <setjmp.h> +#include "tst_test.h" -#include "test.h" - -#define TEMPFILE "mmapfile" - -char *TCID = "mmap05"; -int TST_TOTAL = 1; - +#define TEMPFILE "mmapfile" static size_t page_sz; static volatile char *addr; -static int fildes; -static volatile int pass = 0; +static int fd; +static volatile int sig_flag; static sigjmp_buf env; -static void setup(void); -static void cleanup(void); -static void sig_handler(int sig); - -int main(int ac, char **av) +static void sig_handler(int sig) { - int lc; - char file_content; - - tst_parse_opts(ac, av, NULL, NULL); - - setup(); - - for (lc = 0; TEST_LOOPING(lc); lc++) { - - tst_count = 0; - - /* - * Call mmap to map the temporary file 'TEMPFILE' - * with no access. - */ - errno = 0; - addr = mmap(0, page_sz, PROT_NONE, - MAP_FILE | MAP_SHARED, fildes, 0); - TEST_ERRNO = errno; - - /* Check for the return value of mmap() */ - if (addr == MAP_FAILED) { - tst_resm(TFAIL | TERRNO, "mmap() failed on %s", - TEMPFILE); - continue; - } - - /* - * Try to access the mapped region. This should - * generate a SIGSEGV which will be caught below. - * - * This is wrapped by the sigsetjmp() call that will - * take care of restoring the program's context in an - * elegant way in conjunction with the call to - * siglongjmp() in the signal handler. - */ - if (sigsetjmp(env, 1) == 0) { - file_content = addr[0]; - } - - if (pass) { - tst_resm(TPASS, "Got SIGSEGV as expected"); - } else { - tst_resm(TFAIL, "Mapped memory region with NO " - "access is accessible"); - } - - /* Unmap mapped memory and reset pass in case we are looping */ - if (munmap((void *)addr, page_sz) != 0) { - tst_brkm(TFAIL | TERRNO, cleanup, "munmap failed"); - } - pass = 0; - + if (sig == SIGSEGV) { + sig_flag = 1; + siglongjmp(env, 1); } - - cleanup(); - tst_exit(); } static void setup(void) { - char *tst_buff; - - tst_sig(NOFORK, sig_handler, cleanup); + char *buf; - TEST_PAUSE; + SAFE_SIGNAL(SIGSEGV, sig_handler); page_sz = getpagesize(); + buf = SAFE_MALLOC(page_sz); + memset(buf, 'A', page_sz); - /* Allocate space for the test buffer */ - if ((tst_buff = calloc(page_sz, sizeof(char))) == NULL) { - tst_brkm(TFAIL, NULL, "calloc failed (tst_buff)"); - } - - /* Fill the test buffer with the known data */ - memset(tst_buff, 'A', page_sz); - - tst_tmpdir(); - - /* Creat a temporary file used for mapping */ - if ((fildes = open(TEMPFILE, O_WRONLY | O_CREAT, 0666)) < 0) { - free(tst_buff); - tst_brkm(TFAIL | TERRNO, cleanup, "opening %s failed", - TEMPFILE); - } + fd = SAFE_OPEN(TEMPFILE, O_RDWR | O_CREAT, 0666); + SAFE_WRITE(SAFE_WRITE_ALL, fd, buf, page_sz); + free(buf); +} - /* Write test buffer contents into temporary file */ - if (write(fildes, tst_buff, page_sz) != (int)page_sz) { - free(tst_buff); - tst_brkm(TFAIL, cleanup, "writing to %s failed", TEMPFILE); +static void run(void) +{ + addr = mmap(NULL, page_sz, PROT_NONE, MAP_FILE | MAP_SHARED, fd, 0); + if (addr == MAP_FAILED) { + tst_res(TFAIL | TERRNO, "mmap() of %s failed", TEMPFILE); + return; } - /* Free the memory allocated for test buffer */ - free(tst_buff); + if (sigsetjmp(env, 1) == 0) + tst_res(TINFO, "Trying to access mapped region: %c", addr[0]); - /* Make sure proper permissions set on file */ - if (fchmod(fildes, 0444) < 0) { - tst_brkm(TFAIL | TERRNO, cleanup, "fchmod of %s failed", - TEMPFILE); - } + if (sig_flag) + tst_res(TPASS, "Received SIGSEGV signal as expected"); + else + tst_res(TFAIL, "SIGSEGV signal not received"); - /* Close the temporary file opened for write */ - if (close(fildes) < 0) { - tst_brkm(TFAIL | TERRNO, cleanup, "closing %s failed", - TEMPFILE); - } + SAFE_MUNMAP((char *)addr, page_sz); - /* Open the temporary file again for reading */ - if ((fildes = open(TEMPFILE, O_RDONLY)) < 0) { - tst_brkm(TFAIL | TERRNO, cleanup, "opening %s readonly failed", - TEMPFILE); - } -} - -/* - * sig_handler() - Signal Catching function. - * This function gets executed when the test process receives - * the signal SIGSEGV while trying to access the contents of memory which - * is not accessible. - */ -static void sig_handler(int sig) -{ - if (sig == SIGSEGV) { - /* set the global variable and jump back */ - pass = 1; - siglongjmp(env, 1); - } else { - tst_brkm(TBROK, cleanup, "received an unexpected signal: %d", - sig); - } + sig_flag = 0; } static void cleanup(void) { - close(fildes); - tst_rmdir(); + if (fd > 0) + SAFE_CLOSE(fd); } + +static struct tst_test test = { + .setup = setup, + .cleanup = cleanup, + .test_all = run, + .needs_tmpdir = 1 +}; |